Light irradiating device and particle imaging device comprising the light irradiating device

Abstract

An light irradiating device is described, a representative of which includes: a light source; a first projector lens system including, a first lens member for collimating a light beam emitted from the light source into a collimated light beam, a wavelength selecting unit for selectively transmitting a light having a spectral characteristic in which a central wavelength is not more than 450 nanometers and a half-value width is not more than 40 nanometers, a second lens member for condensing the light transmitted through the wavelength selecting unit, and an adjusting member comprising a transmitting part which has a predetermined sectional area and transmits the light beam condensed by the second lens member; and a second projector lens system for condensing the light emitted from the adjusting member and irradiating the light beam on an object.

1 . An light irradiating device comprising: 
 a light source;    a first projector lens system including, a first lens member for collimating a light beam emitted from the light source into a collimated light beam, a wavelength selecting unit for selectively transmitting a light having a spectral characteristic in which a central wavelength is not more than 450 nanometers and a half-value width is not more than 40 nanometers, a second lens member for condensing the light transmitted through the wavelength selecting unit, and an adjusting member comprising a transmitting part which has a predetermined sectional area and transmits the light beam condensed by the second lens member; and    a second projector lens system for condensing the light emitted from the adjusting member and irradiating the light beam on an object.    
   
   
       2 . An light irradiating device as claimed in  claim 1 , wherein an optical image irradiated on the object is an image including a coma aberration.  
   
   
       3 . An light irradiating device as claimed in  claim 2 , wherein a coma aberration in one of the first projector lens system and the second projector lens system is larger than a comma aberration in the other.  
   
   
       4 . An light irradiating device as claimed in  claim 1 , wherein a lens numerical aperture number (NA) of the first lens member on the light source side is in the range of 0.30-0.75.  
   
   
       5 . An light irradiating device as claimed in  claim 1 , wherein the transmitting part has a pinhole as the adjusting member.  
   
   
       6 . An light irradiating device as claimed in  claim 1 , wherein the transmitting part has a multi-mode optical fiber as the adjusting member.  
   
   
       7 . An light irradiating device as claimed in  claim 1 , wherein the first projector lens system comprises at least an aspherical lens.  
   
   
       8 . An light irradiating device as claimed in  claim 1 , wherein the second projector lens system comprises at least an aspherical lens.  
   
   
       9 . An light irradiating device as claimed in  claim 1 , wherein the second projector lens system comprises an opening iris for adjusting a numerical aperture number (NA).  
   
   
       10 . An light irradiating device as claimed in  claim 1 , wherein the second projector lens system irradiates a light on the object in an area of an illuminated region 0.5-3 times as large as a sectional area of the transmitting part of the adjusting member.  
   
   
       11 . A particle imaging device for imaging a particle, comprising: 
 a light source;    an light irradiating device comprising a first projector lens system and a second projector lens system, the first projector lens system including, a first lens member for collimating a light beam emitted from the light source into a collimated light beam, a wavelength selecting unit for selectively transmitting a light having a spectral characteristic in which a central wavelength is not more than 450 nanometers and a half-value width is not more than 40 nanometers, a second lens member for condensing the light transmitted through the wavelength selecting unit, an adjusting member comprising a transmitting part which has a predetermined sectional area and transmits the light beam condensed by the second lens member, and the second projector lens system condensing the light beam emitted from the adjusting member and irradiating the light beam on an object; and    an imaging element for imaging the particle illuminated by the light irradiating device.    
   
   
       12 . Aparticle imaging device as claimed in  claim 11 , wherein the wavelength selecting unit transmits a light having a coherence length 1-300 times as long as a diameter of the particle.  
   
   
       13 . An light irradiating device comprising: 
 a light source;    a first projector lens system including, a first lens member for collimating a light beam emitted from the light source into a collimated light beam, a second lens member for condensing the collimated light transmitted through first lens member, and an adjusting member comprising a transmitting part which has a predetermined sectional area and transmits the light beam condensed by the second lens member; and    a second projector lens system for condensing the light beam emitted from the adjusting member and irradiating the light beam on an object.    
   
   
       14 . An light irradiating device as claimed in  claim 13 , wherein an optical image irradiated on the object is an image including a coma aberration.  
   
   
       15 . An light irradiating device as claimed in  claim 13 , wherein a coma aberration in one of the first projector lens system and the second projector lens system is larger than a comma aberration in the other.  
   
   
       16 . An light irradiating device as claimed in  claim 13 , wherein a lens numerical aperture number (NA) of the first lens member on the light source side is in the range of 0.30-0.75.  
   
   
       17 . An light irradiating device as claimed in  claim 13 , wherein the transmitting part has a pinhole as the adjusting member.  
   
   
       18 . An light irradiating device as claimed in  claim 13 , wherein the transmitting part has a multi-mode optical fiber as the adjusting member.  
   
   
       19 . An light irradiating device as claimed in  claim 13 , wherein one of the first projector lens system and the second projector lens system comprises at least an aspherical lens.  
   
   
       20 . An light irradiating device as claimed in  claim 13 , wherein the second projector lens system comprises an opening iris for adjusting a numerical aperture number (NA).